Faulty camshaft position actuator solenoid (sticking or internally shorted); Damaged or corroded wiring harness connector at the actuator; Open or short circuit in the signal wire between the actuator and ECM; Contaminated engine oil causing actuator malfunction; Failed ECM driver circuit for the actuator (less common)

DTC codes / BMW codes / P1524

P1524 · BMWA Camshaft Position Actuator Signal High Bank 1

Q: What does code P1524 mean?

A Camshaft Position Actuator Signal High Bank 1. P1524 on BMW vehicles indicates that the engine control module (ECM) has detected an abnormally high signal voltage from the camshaft position actuator on bank 1. This typically means the actuator's feedback circuit is reporting a voltage above the expected range, which can affect variable valve timing performance.

P1524 on BMW vehicles indicates that the engine control module (ECM) has detected an abnormally high signal voltage from the camshaft position actuator on bank 1. This typically means the actuator's feedback circuit is reporting a voltage above the expected range, which can affect variable valve timing performance.

SystemPowertrain

Code typeBMW specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or engine misfire, particularly when cold
Reduced engine performance or sluggish acceleration
Poor fuel economy due to incorrect valve timing
In rare cases, the engine may enter limp mode

Common causes, most likely first

Faulty camshaft position actuator solenoid (sticking or internally shorted)
Damaged or corroded wiring harness connector at the actuator
Open or short circuit in the signal wire between the actuator and ECM
Contaminated engine oil causing actuator malfunction
Failed ECM driver circuit for the actuator (less common)

How to diagnose and fix it

Perform a visual inspection of the actuator connector and wiring for damage or corrosion
Check the actuator's resistance and compare to BMW specifications
Measure signal voltage at the actuator connector with the key on and engine off
Verify oil quality and change engine oil if contaminated or overdue
Test the actuator with a known-good unit or use a bidirectional scan tool to command the actuator
Inspect the ECM connector and wiring for continuity and shorts
Replace the camshaft position actuator if all electrical tests pass

Common misdiagnosis traps for P1524

A high signal voltage can be caused by a poor ground connection at the actuator, which is often overlooked during diagnosis.
Engine oil sludge or debris can block the actuator's oil passages, leading to a high signal without any electrical fault.
The code may be set intermittently due to a loose connector that only loses contact under vibration.
Replacing the actuator without checking the wiring harness can lead to a repeat failure if the underlying issue is a chafed wire.
On some BMW models, a software update to the ECM can alter the threshold for this code, so check for technical service bulletins.

Can I keep driving with P1524?

It is generally safe to drive with this code if the engine is running smoothly, but avoid aggressive acceleration or heavy loads until repaired. If the engine runs rough or enters limp mode, seek service immediately.

Tools that help

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Guidance is general and written for BMW vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.